<!DOCTYPE html>
<html>
  <head>
    <style>
      .testDiv {
        overflow: hidden;
        text-overflow: ellipsis;
        font-size: 72px;
        /* The height should be a little larger than logical width of Ahem character "Bl". */
        height: 150px;
        -webkit-writing-mode: vertical-rl;
      }
    </style>
  </head>
  <body>
    <!-- We should use Ahem because the character "i" should be overflowed on all platforms. -->
    <div class="testDiv"><span style="font-family: Ahem">Bl</span>ink</div>
  </body>
</html>
